Remove deck CSV workflow and simplify CLI

[fmolinagomez]

Summary

• drop deck CSV handling from the CLI so cards are always rendered individually from the JSON definition into an output folder
• update the image processing helpers to work with explicit output directories instead of deck names
• refresh the README to describe the streamlined command options and generated folder structure

Testing

• python -m pytest

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https://chatgpt.com/codex/tasks/task_e_68e3a37225e0832e8632dd3eccc661f6

[chatgpt-codex-connector]

💡 Codex Review

LightWeightCardPrototyping/add_images.py

Lines 122 to 133 in 2e5d645

	@lru_cache(maxsize=128)
	def _load_full_frame_surface_cached(image_name: str, dpi: int):
	size_px = layout.pair_mm_to_pixels((layout.CARD_WIDTH_MM, layout.CARD_HEIGHT_MM), dpi)
	resized_image = _load_resized_source_image(image_name, size_px)
	if resized_image is None:
	return None
	buffer = io.BytesIO()
	resized_image.save(buffer, format='PNG')
	buffer.seek(0)
	surface = cairo.ImageSurface.create_from_png(buffer)
	return surface

Import io for full-frame image rendering

The _load_full_frame_surface_cached helper now converts images into an in-memory PNG using io.BytesIO, but add_images.py no longer imports the io module. When cards have full_frame_image enabled and --images is passed, the first call to load_full_frame_surface will raise NameError: name 'io' is not defined, preventing full-frame images from rendering. Adding import io at the top of the module fixes the crash.

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